US6118097A - Machining head and laser machining apparatus - Google Patents

Machining head and laser machining apparatus Download PDF

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Publication number
US6118097A
US6118097A US08/139,888 US13988893A US6118097A US 6118097 A US6118097 A US 6118097A US 13988893 A US13988893 A US 13988893A US 6118097 A US6118097 A US 6118097A
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Prior art keywords
assist gas
nozzle
sub
main
flow
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US08/139,888
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English (en)
Inventor
Kunihiko Kaga
Satoru Kotoh
Shuji Ogawa
Masaru Kanaoka
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI DENKI KABUSHIKI KAISHA reassignment MITSUBISHI DENKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAGA, KUNIHIKO, KANAOKA, MASARU, KOTOH, SATORU, OGAWA, SHUJI
Priority to US08/326,265 priority Critical patent/US5609781A/en
Priority to US09/603,906 priority patent/US6288363B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1462—Nozzles; Features related to nozzles
    • B23K26/1464—Supply to, or discharge from, nozzles of media, e.g. gas, powder, wire
    • B23K26/1476—Features inside the nozzle for feeding the fluid stream through the nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1435—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor involving specially adapted flow control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1435—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor involving specially adapted flow control means
    • B23K26/1438—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor involving specially adapted flow control means for directional control

Definitions

  • the invention relates to a laser machining head for cutting work and a laser machining apparatus for controlling the laser machining head.
  • the cutting performance of a laser machining apparatus is affected by operating conditions such as the location of the focal point of the laser beam against the work surface, the assist gas pressure and the distance between the work surface and the leading edge of the laser beam nozzle. It also depends on conditions such as the kinds of material, surface condition, quality, composition, and thickness of the work. Regarding the laser machining apparatus, it is expected to work under a wide range of conditions and for a wide range of materials as described above and to obtain a stable machining quality. Especially, in case of cutting steel and so on, the metal which is melted by direct laser beam heating is not only blown off by an oxygen jet flow used as an assist gas, but is also sublimated or melted with a strong oxidized burning reaction, which improves cutting efficiency. Therefore, the cross sectional quality of the work surface very much depends upon oxidized burning speed on it.
  • FIG. 31 is a longitudinal sectional view of a laser beam nozzle which is installed in the machining head of a conventional laser machining apparatus.
  • the laser beam nozzle is disclosed, for example, in Japanese patent publication No. 61-60757.
  • the numeral 1 denotes a main assist gas nozzle
  • the numeral 2 denotes a sub assist gas nozzle
  • the numeral 3 denotes a surface of the material being cut
  • the numeral 10 denotes an assist gas source.
  • the operation of laser beam machining apparatus is explained hereafter.
  • the laser beam nozzle installed in a conventional laser beam machining apparatus is constructed as mentioned above.
  • the nozzle has a multiple structure which comprises a gas flow path on the center axis and concentric multiple gas flow paths arranged around the center gas flow path.
  • the oxygen supplied to the material being cut from the gas flow path on center axis has comparatively high pressure and is discharged at a high speed.
  • the oxygen is supplied mainly into the cutting groove and used partially for the oxidized burning reaction.
  • the remaining oxygen is used to blow off and eliminate the melted and oxidized material.
  • the oxygen supplied from the outside flow path flows at a comparatively low speed.
  • the air, flowing from the outside stabilizes the gas flow near the center axis and keeps the oxygen concentration at a high level.
  • the direction of jet flow from the outlet of the sub assist gas is arranged parallel to the outlet of the main assist gas and keeps the assist gas in a laminar flow. Since there are thick walls at the border of outlets of the main assist gas and the outlet of each sub assist gas, and also since the interference between the main assist gas and the sub assist gas is suppressed, main assist gas is kept in the laminar flow condition accordingly.
  • assist gas oxygen gas
  • the oxidized burning reaction occurs due to the assist gas (oxygen gas) supplied to the cutting surface of the metal which is heated to a high temperature by the energy of the laser beam.
  • Combustion products gas or melted metal
  • the jet flow of the assist gas (oxygen gas) is in a laminar flow condition, the assist gas must reach the metal surface by dispersing through the ambient combustion product (gas composition). It is effective accordingly to make a jet flow of assist gas turbulent, to disturb the boundary layer in the combustion reaction area near the cutting surface and to replace the combustion product (gas composition) with fresh assist gas in order to increase the speed of combustion.
  • the laser beam nozzle installed in machining head of a conventional laser machining apparatus is arranged so that the jet direction of the sub assist gas outlet is parallel to that of the main assist gas outlet, and discharges the sub assist gas in a laminar flow, so that the interference with the main assist gas is greatly suppressed. Therefore, the main assist gas is kept in a laminar flow and stabilized.
  • the purity of the assist gas oxygen purity
  • the gas flow at the center portion is stabilized, it is necessary to increase supply pressure of the main assist gas so as to effectively supply the assist gas (oxygen gas) into the narrow cutting groove.
  • the jet flows of the main assist gas, each sub assist gas and the surrounding air are separated at the thick wall of their respective boundary. Therefore, there is a further another problem that the main assist gas purity (oxygen purity) decreases, since diffusion mixing improves between the main assist gas and the sub assist gas, and the isolation effect is decreased between the outermost sub assist gas and the surrounding air.
  • main assist gas purity oxygen purity
  • assist gas oxygen gas
  • a machining head of a laser machining apparatus in which the laser beam passes through, the machining head comprises a main assist gas nozzle at the center portion of the machining head for supplying a main assist gas; one or more annular sub assist gas nozzles which surround the main assist gas nozzle, whose jet outlet of the most inside diameter is larger or equal to the jet outlet of main assist gas nozzle.
  • a machining head wherein the main assist gas nozzle comprises at least one circulation flow forming means which allow a part of the main assist gas to circulate.
  • a machining head wherein the circulation flow forming means comprises twisted wings or grooves mounted on an inside wall of the main assist gas nozzle.
  • the circulation flow forming means comprises a plurality of sub flow nozzles each of which has a sub nozzle outlet in the main assist gas nozzle and discharges the main assist gas in a circumferential direction from the sub nozzle outlet.
  • a machining head wherein the jet outlet of main assist gas nozzle is positioned at an upper gas stream side of said jet outlets of a respective sub assist gas nozzle.
  • a machining head wherein the machining head further comprises a static pressure conversion means which converts the dynamic pressure of the assist gas which flows into the sub assist gas nozzle through sub assist gas supply inlets into static pressure.
  • the static pressure conversion means comprises a static pressure conversion surface which faces against the sub assist gas inlet; and a bank which is located at an inside edge of the static pressure conversion surface and forms a space where the sub assist gas stays.
  • a machining head wherein the machining head further comprises sub assist gas supply inlets which are located around the main assist gas supply inlet and adjust the sub assist gas flow, and the main assist gas and the sub assist gas are supplied from a common gas source to the main assist gas supply inlet and the sub assist gas supply inlets.
  • a machining head wherein the machining head further comprises aperture area adjusting means located at the sub assist gas supply inlets for adjusting sub assist gas flow.
  • a machining head wherein the machining head further comprises at least one fluid resistance body located at the sub assist gas supply inlets for adjusting sub assist gas flow.
  • a laser machining apparatus which comprises a main assist gas nozzle and one or more sub assist gas nozzles, wherein the laser machining apparatus comprises at least one assist gas sources for supplying assist gas to at least one of a main assist gas inlet and a sub assist gas inlet; sensors for detecting the temperature of the machining surface, the width of the cutting groove, or the amount of spark; and a flow quantity control apparatus for adjusting the flow quantity and pressure of the assist gas during machining in response to the signals from the sensors.
  • a laser machining apparatus which comprises a main assist gas nozzle and one or more sub assist gas nozzles, wherein the laser machining comprises an operation control means for controlling assist gas flow quantity and assist gas pressure discharged from said machining head by programming control.
  • FIG. 1 is a longitudinal cross sectional view which illustrates a machining head of a laser machining apparatus which corresponds to a first embodiment.
  • FIG. 2 illustrates a pressure fluctuation distribution of assist gas flow on the cutting work surface of the embodiment 1.
  • FIG. 3 illustrates the principle for improving the cutting characteristic of the first embodiment.
  • FIG. 4 illustrates a flow velocity distribution on the cutting work surface in an arrangement according to the first embodiment.
  • FIG. 5 illustrates the relationship between the pressure fluctuation value of assist gas flow and the roughness of the cutting surface in the present invention.
  • FIGS. 6A and 6B illustrate a comparison between the machining velocity and tolerance for laser output power of the first embodiment and the conventional example.
  • FIG. 7 is a longitudinal cross sectional view which shows the positional relationship between the jet outlets of machining head of the embodiment 1.
  • FIG. 8 illustrates relationship of the pressure fluctuation value of assist gas flow as a function of the distance L between main and sub jet outlets of the first embodiment.
  • FIG. 9 illustrates a machining head according to a second embodiment.
  • FIGS. 10A, 10B, 10C are a cross-sectional view and perspective views which illustrate the inside of a machining head according to a third embodiment.
  • FIGS. 11A, 11B illustrate main assist gas nozzles of a machining head of a fourth embodiment.
  • FIGS. 12A, 12B illustrate main assist gas nozzles of a machining head of a fifth embodiment.
  • FIG. 13 is a longitudinal cross sectional view which illustrates a machining head of a sixth embodiment.
  • FIG. 14 is a longitudinal cross sectional view which illustrates a machining head of a seventh embodiment.
  • FIG. 15 illustrates the pressure fluctuation value of assist gas flow on the work surfaces as a function of the distance in a radial direction regarding the sixth and seventh embodiments and a conventional example.
  • FIG. 16 is a longitudinal cross sectional view which illustrates a machining head of the embodiment 8 in the invention.
  • FIG. 17 is a longitudinal cross sectional view which illustrates a machining head of a ninth embodiment.
  • FIG. 18 is partial perspective view which illustrates a machining head of a tenth embodiment.
  • FIGS. 19A and 19B are plan views which illustrate other examples of small hole shapes for assist gas supply inlet of the embodiment 10.
  • FIG. 20 is a partial perspective view which illustrates a machining head of a eleventh embodiment.
  • FIG. 21 is a longitudinal cross sectional view which illustrates a machining head of a twelfth embodiment.
  • FIG. 22 is a plan view which illustrates an aperture area adjusting means of a thirteenth embodiment.
  • FIG. 23 is plan view which illustrates an aperture area adjusting means of a fourteenth embodiment.
  • FIG. 24 is a longitudinal cross sectional view which illustrates a machining head of a laser machining apparatus of a fifteenth embodiment.
  • FIG. 25 illustrates the construction of a laser machining apparatus of a sixteenth embodiment.
  • FIG. 26 illustrates a construction of a laser machining apparatus of a seventeenth embodiment.
  • FIG. 27 illustrates a construction of a laser machining apparatus of an eighteenth embodiment.
  • FIG. 28 is a longitudinal cross sectional view which illustrates a machining head of laser machining apparatus of a nineteenth embodiment.
  • FIGS. 29A and 29B are longitudinal cross sectional views which illustrate another example of a machining head of laser machining apparatus of the nineteenth embodiment.
  • FIG. 30 is a longitudinal cross sectional view which illustrates a machining head of laser machining apparatus of a twentieth embodiment.
  • FIG. 31 is a longitudinal cross sectional view which illustrates a conventional machining head of a laser machining apparatus.
  • FIG. 1 is a longitudinal sectional view which illustrates a machining head of a laser machining apparatus corresponding to the first embodiment of the present invention.
  • the machining head comprises a main assist gas jet nozzle outlet 1a having a diameter of D 1 which is located at an innermost position and a main assist gas nozzle duct 1b which is adjacent to the main assist gas jet nozzle outlet 1a.
  • the main assist gas nozzle 1 is where the laser beam passes through, inside a sub assist gas nozzle jet outlet 2.
  • the sub assist gas nozzle jet outlet 2 comprises a sub assist gas nozzle 2a having a diameter of D 2 (D 2 ⁇ D 1 , D 2 >D 1 in this case) which is located outside of the main assist gas nozzle 1 and a duct 2b adjacent to the sub assist gas nozzle 2a form a multiple part construction (in this case, two part -construction).
  • the jet outlet 1a of the main assist gas nozzle 1 is located upstream of the jet outlet 2a of sub assist gas nozzle 2.
  • This construction causes jet gas pressure and the jet gas flow velocity to vary continuously at the jet outlet, and allows both the pressure fluctuation and the flow velocity fluctuation of the main assist gas flow to be large.
  • the assist gas oxygen gas
  • the assist gas is supplied on the cutting work surface 3 through the path as indicated by the arrows in the figure.
  • FIG. 2 illustrates a pressure fluctuation distribution of assist gas flow on the cutting work surface 3.
  • the vertical scale shows pressure fluctuation p/P (%) (p: pressure fluctuation, P: absolute pressure).
  • the curve corresponds to the location of the jet outlet of assist gas. Since the flow velocity fluctuation of assist gas which flows through the main assist gas nozzle is large, the pressure fluctuation of main assist gas just below the jet outlet 1a is large, alternately the pressure fluctuation of sub assist gas just below jet outlet 2a is controlled to be low. The desired amount of gas flow is supplied to the cutting groove without increasing original pressure by the pumping effect of the pressure fluctuation.
  • the large fluctuation of flow velocity means that the turbulence of oxygen gas flow supplied into the cutting groove is large and the gas flow is in the state of turbulent flow.
  • an oxide produced by the reaction and oxygen form a mixed layer, and the oxidized reaction speed depends upon the velocity at which oxygen reaches the reaction surface by dispersing through inside said mixed layer. It is accordingly effective to cause the gas flow to be in the state of turbulent flow and to cause the mixed layer to be unstable for increasing the rate of the oxidized reaction.
  • a machining head having a nozzle construction such as described above causes the oxygen gas flow to be in the state of turbulent flow.
  • the machining head of the present embodiment causes the mixed layer to be unstable as explained in FIG. 3. Therefore, it is possible to supply the oxygen gas directly near the reaction surface and to remove simultaneously the mixed gas having high oxide concentration out of the reaction area. Accordingly, the oxidized burning rate is increased remarkably due to an increased amount of oxygen supplied, and high speed cutting becomes possible. Since the supplied oxygen gas is effectively consumed continuously, the self-burning caused by the temperature rise due to laser and the imbalance of the oxidized reaction rate can be prevented and stable machining can be carried out.
  • the assist gas oxygen gas
  • the assist gas nozzle jet Since the flow of ambient air is prevented by the assist gas (oxygen gas) which flows from the assist gas nozzle jet, the purity of oxygen at center flow (namely, the main assist gas) which flows into the cutting groove is maintained and stable cutting can be achieved.
  • FIG. 4 illustrates a flow velocity distribution on the cutting work surface of the first embodiment.
  • the vertical scale indicates jet gas flow velocity U (m/s) corresponding to the assist gas jet outlet.
  • U jet gas flow velocity
  • FIG. 5 illustrates relationship between the roughness of the cutting surface versus the pressure fluctuation value of the assist gas flow of the present invention.
  • the horizontal scale shows the pressure fluctuation value (%) which is the pressure ratio of the pressure fluctuation component p against the pressure P of the main assist gas (p/P) on the work surface just under the center axis.
  • the vertical scale indicates the cutting surface roughness Rmax ( ⁇ m).
  • the cutting material is mild steel SS400 having a thickness of 12 mm.
  • the machining condition is defined such that the laser power is 1400 W, and the machining velocity is 0.7 m/min. It is clearly understood from FIG. 5 that the larger the pressure fluctuation value is, the less the cutting surface roughness is. Namely, FIG. 5 indicates that high speed cutting in good quality can be achieved by machining using a machining head having a nozzle construction of the embodiment of the present invention.
  • FIGS. 6A and 6B illustrate tolerances of the machining velocity against the laser output power during a laser cutting test using the machining head of the present embodiment and the conventional machining head.
  • the vertical scale shows machining velocity (m/min)
  • the horizontal scale shows laser output power (kw).
  • the material used is SS400, having a thickness of 12 mm.
  • FIG. 6A indicates the tolerance of the conventional type machining head (pressure fluctuation value is 0.1 (%)
  • FIG. 6B indicates that of the machining head of the present embodiment.
  • the areas covered with slanted lines in FIGS. 6A, 6B are areas for normal machining for cutting. As seen from the figures, it is understood easily that high-speed cutting may be achieved using the machining head of the present embodiment.
  • FIG. 7 is a longitudinal cross sectional view which shows the positional relationship between the jet outlets of machining head of the embodiment 1. More precisely, FIG. 7 illustrates the relation between the locations of main assist gas nozzle jet outlets 1a and main assist gas nozzle duct 1b and also the relation of distance between the cutting work surface 3 and the lower edge of the nozzle (jet outlet).
  • the letter L in the figure indicates the distance between the sub assist gas jet outlet 2a and the main assist gas nozzle jet outlet 1a
  • the letter H in the figure indicates a distance between a cutting work surface 3 and the lower edge of the sub assist gas jet outlet 2a (jet outlet).
  • FIG. 8 illustrates relationship of the pressure fluctuation value p/P (%) just below the center axis of nozzle against the distance L between the main jet outlet and the sub jet outlet of the embodiment 1, while H is changed, where H is a distance in millimeter from the cutting work surface 3 to the lower edge of the nozzle 2a.
  • the vertical scale indicates a pressure fluctuation value p/P (%)
  • the horizontal scale indicates a distance L between the main jet outlet 1a and the sub jet outlet 2a.
  • FIG. 9 illustrates a machining head according to a second the embodiment.
  • the machining head in the above embodiment comprises one main assist gas nozzle 1 and one sub assist gas nozzle 2, it is needless to say that the sub assist gas nozzle 2 may be constituted as a multiplex type construction as indicated in the longitudinal cross sectional view of FIG. 9.
  • the second embodiment if the jet outlet 1a of the main assist gas is located upstream of any one of the plurality of jet outlets 2a, the second embodiment has effects similar to these of the first embodiment.
  • FIGS. 10A, 10B and 10C are a cross sectional view and two perspective views which illustrate the inside of the machining head according to a third embodiment.
  • a plurality of static wings twisted in a screw shape are mounted on the inner surface of the main assist nozzle 1 for causing twisting flows which increases the pressure and flow velocity fluctuation of the main assist gas flow.
  • FIG. 10A illustrates a longitudinal sectional view of the machining head of this third embodiment.
  • FIG. 10B illustrates a perspective view showing the inside of the main assist gas nozzle 1.
  • a plurality of the twisted static wings 4 are installed on the straight portion inside the duct wall of the main assist gas nozzle 1. These static wings 4 generate a circulating gas flow which flows inside the main assist gas nozzle.
  • the jet flow has a large turbulent flow strength at the center axis when it includes a circulating component at the jet outlet portion.
  • the turbulent ratio may reach more than 10% in case where the distance from the nozzle to the cutting work surface is substantially equal to the nozzle diameter. Therefore, the oxidized burning reaction is effectively caused, oxidation velocity is accelerated and the machining quality and the stability are improved accordingly.
  • the high-speed cutting may be attained simultaneously.
  • the diameter of laser beam at the lower edge of the main assist gas nozzle must be large so as to locate the main assist gas more closely to the machining optical lens side. Therefore, it is comparatively difficult to align the laser beam axis with the nozzle center axis and to adjust the distance between the laser beam focal point and the work surface.
  • the above adjustment can be easily achieved since the flow velocity of the main assist gas varies even if the relative distance L between the jet outlets of both nozzles is set to zero.
  • FIG. 10C is a perspective view which illustrates the inside of the machining head of the third embodiment.
  • the static wings may be installed at a contraction flow portion of the lower stream of the main assist gas nozzles shown in FIG. 10C.
  • FIGS. 11A, 11B are perspective view which shows the main assist gas nozzle of the machining head according to a fourth embodiment.
  • a plurality of twisted grooves 5 are provided at a straight portion inside the duct wall of the main assist gas nozzle 1 as circulation flow forming means.
  • the turbulent flow strength at the central part of the main assist gas jet flow increases since a part of the main assist gas (oxygen gas) flows through the main assist gas nozzle 1 and generates a circulating flow along the twisted grooves 5. Therefore, in this case, oxidization velocity is promoted, and the cutting velocity and the cutting quality may be improved.
  • the twisted groove 5 may be installed in a contraction flow portion located at the lower stream of the main assist gas nozzle 1 as illustrated in FIG. 11B.
  • FIGS. 12A, 12B illustrate main assist gas nozzles of the machining head of the embodiment 5.
  • FIG. 12A is its top view
  • FIG. 12B is its longitudinal cross sectional view.
  • main assist gas is main assist gas
  • nozzles 6a are installed at the inside wall of the main assist gas nozzle 1 as the circulation flow forming means, and sub flow nozzles 6 of the main assist gas are installed symmetrically with respect to one another, which discharge gas in a circumferential direction in parallel to the main assist gas nozzle 1 (namely, the sub flow of main assist gas is discharged in the tangential direction of the outside circle of the main flow of the main assist gas).
  • part of the main assist gas is discharged through the sub flow nozzles 6 of main assist gas and the main assist gas is circulated accordingly. Therefore, the same effects are achieved in this fifth embodiment as in that of in third and fourth the embodiments.
  • FIG. 13 is a longitudinal cross sectional view which illustrates the machining head according to the sixth embodiment.
  • a static pressure conversion means (a static pressure conversion surface 7, in this case) which converts the dynamic pressure of the sub assist gas flow supplied through the gas supply inlet 2c to static pressure are installed at the location where the gas flow pass through the gas duct 2b.
  • Broken line arrows show the assist gas flows. Since the gas directed toward the inside of the assist gas nozzle 2b is recovered to the static pressure after colliding against static pressure conversion surface 7, the assist gas flows homogeneously in the lower stream of static pressure conversion surface 7 and is discharged through the jet outlet 2a of the sub assist gas. The gas flow outside the nozzle, therefore, becomes homogeneous with less turbulence and inflow of ambient air is effectively prevented.
  • the static pressure conversion surface 7 is installed at the flat portion parallel to the bottom surface of the nozzle outlet 2a.
  • the static pressure conversion surface 7 is not parallel to the bottom surface 2a or it is not installed at the flat surface, if it collides with the gas which is directed to the flow path of the circumference flow nozzle (namely, sub assist gas nozzle) and causes the gas flow to recover to the static pressure.
  • FIG. 14 is a longitudinal cross sectional view which illustrates a machining head according to a seventh embodiment.
  • an annular return wall surface 8 protrudes at the edge of static pressure conversion surface 7 which is provided inside the sub assist gas duct 2b of the embodiment 6.
  • the return wall surface 8 forms a gas residence space 8a, where the upper edge of the return wall surface and inside circumference nozzle are adjusted. In the case shown, the height is adjusted so that the appropriate clearance exists between the upper edge of the return wall surface 8 and the outside wall of the main assist gas nozzle 1.
  • the broken line arrows in FIG. 14 illustrate the directions of gas flow.
  • the gas flow supplied through the gas supply inlet 2c temporarily fills the gas residence space 8a, which is comprised of the return wall surface 8, the inside wall of the sub assist gas nozzle 2 and the static pressure conversion surface 7, and then the static pressure of the gas flow is recovered.
  • the gas flows with homogeneous flow velocity from the upper edge of the return wall surface 8 to the duct 2b of the sub assist gas nozzle, then the gas is discharged toward the outside through the jet outlet 2a. Therefore, the outside circumference flow becomes a steady and homogeneous flow with less turbulence and the inflow of the air improved more effectively.
  • FIG. 15 illustrates a characteristic curve which shows the pressure fluctuation value of the assist gas flow on the work surface versus distance from the center axis toward the radial direction regarding the sixth and seventh embodiments and the conventional example.
  • the vertical scale indicates the pressure fluctuation value p/P (%)
  • the horizontal scale indicates distance r (mm) from the center axis of the nozzle toward radius direction.
  • the solid line shows the characteristic curve for the seventh embodiment
  • the broken line shows that of sixth embodiment
  • the short dash line shows that for the conventional example. From the figure, in the case of the seventh embodiment, it is easily understood that the pressure fluctuation value of sub assist gas at the cutting work surface is smallest and the gas flow is most homogeneous with a steady state. Therefore, the amount of inflow of the surrounding air is decreased and the oxygen purity is kept at a high level.
  • FIG. 16 is a longitudinal cross sectional view which illustrates a machining head of the laser machining apparatus according to an eighth embodiment.
  • an expanded flow path 9 is formed at the front edge of the sub assist gas nozzle 2 where the flow path expands gradually towards the sub assist gas nozzle jet outlet 2a.
  • the sub assist gas (oxygen gas) discharged from the sub assist gas nozzle 2 does not accelerated, and flows parallel to the nozzle center axis without being separated from the inside nozzle wall. Therefore, the inflow of surrounding air into the surrounding flow can be minimized immediately down stream of the nozzle jet outlet, and high oxygen purity can be maintained, and steady machining can be attained.
  • the flow path area gradually expands, but a similar effect is obtained if the flow path area remains constant.
  • FIG. 17 is a longitudinal cross sectional view which illustrates a machining head according to a ninth embodiment.
  • the outermost wall of the multi-nozzles namely, the sub assist gas nozzle 2
  • the outermost wall of the multi-nozzles is formed as a cone-shaped trapezoid which has virtual top angle ⁇ less than 45 degrees.
  • FIG. 18 is partial perspective view which illustrates a machining head according to a tenth embodiment.
  • a common assist gas (oxygen gas) source 10 is installed upstream of the nozzle.
  • the gas supplied from the assist gas source 10 branches to the main assist gas supply inlet 1c and to the plurality of small holes 11 on the surrounding annular portion of the main assist gas nozzle 1 at the center nozzle.
  • the assist gas (oxygen gas) flows into the sub assist gas nozzle duct 2b through the small holes 11.
  • the amount of main assist gas (oxygen gas) flow discharged from the center flow nozzle, namely, main assist gas nozzle 1 and the amount of sub assist gas (oxygen gas) flow discharged from the surrounding flow nozzle, namely, the sub assist gas nozzle 2 are variable according to the preset value of area of the small holes 11 and the number of the small holes 11. Therefore, a desired amount of the main assist gas and the sub assist gas can be easily obtained by selecting the appropriate nozzle, namely, the nozzle with the appropriate area and appropriate number of small holes 11, according to the quality and thickness of the material to be machined.
  • FIGS. 19A, 19B are plan views which illustrate other examples of small hole shapes for the assist gas supply inlet according to a tenth embodiment.
  • the small holes 11 have circular shapes.
  • any shape of small holes 11 is used, for example, a rectangular or oval shape as illustrated in the plan views of FIGS. 19A, 19B, respectively.
  • FIG. 20 is a partial perspective view which illustrates a machining head according to an eleventh embodiment.
  • the flow path is adjusted by installing small holes 11 which are located at the annular portion surrounding the main assist gas supply inlets 1c and supply the sub assist gas to the sub assist gas nozzle 2.
  • the flow quantity of the assist gas is adjusted by a mesh type fluid resistance body 12 installed at the above annular portion as illustrated in FIG. 20.
  • the fluid resistance body 12 may be a porous material.
  • the gas flow supplied to the sub assist gas nozzle 2 is homogeneous and a stable gas flow having less turbulence can be realized by selecting an appropriate mesh size of the fluid resistance body or appropriate porous material.
  • FIG. 21 is a longitudinal cross sectional view which illustrates a machining head of the laser machining apparatus according to a twelfth embodiment.
  • an aperture area adjusting means 13 is installed at the sub assist gas supply inlet of the sub assist gas nozzle 2.
  • the aperture area of the aperture area adjusting means 13 can be adjusted manually or automatically using a driving apparatus.
  • FIG. 22 is a plan view which illustrates an aperture area adjusting means according to a thirteenth embodiment, which separates the main assist gas flow from the sub assist gas flow.
  • a concrete example of construction of the aperture area adjusting means 13 of the above embodiment 12 is illustrated.
  • an annular disc 14 contacts the annular portion which has a plurality of small holes 11 for directing the assist gas to the sub assist gas nozzle.
  • the annular disc 14 has a plurality of similar small holes 15 thereon and also has a knob 16 at the outside thereof.
  • the annular disc 14 is moved manually to adjust the aperture area, where the small holes 11 overlap with the small holes 15, which supplies the sub assist gas to the sub assist gas nozzle. Therefore, the flow quantity of the assist gas to be supplied to sub assist gas nozzle can be easily adjusted by moving the annular disc 14 which varies aperture area of gas flow inlet.
  • annular disc 14 is operated manually by the knob 16 connected to the outside nozzle in the embodiment, it is needless to say that automatic driving means may also be useful.
  • FIG. 23 is plan view which illustrates an aperture area adjusting means according to a fourteenth embodiment.
  • the aperture area adjusting means of the fourteenth embodiment comprises a flow restriction means 17 which restricts the plurality of small round holes 11 which supplies assist gas to the sub assist gas nozzle.
  • the aperture area adjusting means 17 also has a knob 16 which permits manual adjustment of the degree of restriction of the aperture area from the outside of the nozzle.
  • the aperture area of the gas supply inlet for supplying the sub assist gas is varied by adjusting the restriction means 17, whereby the supply gas flow quantity can be adjusted.
  • aperture area adjusting means 17 is operated manually by the knob 16 connected to the outside nozzle in the embodiment, it is needless to say that automatic driving means may be useful.
  • FIG. 24 is a longitudinal cross sectional view which illustrates a machining head of laser machining apparatus according to a fifteenth embodiment.
  • a gas (oxygen gas) source for main assist gas nozzle 1 and a gas source for sub assist gas nozzle 2 are separately provided. Therefore, it is possible to supply the appropriate flow quantity of assist gas and to supply oxygen with appropriate flow quantity ratio of the main assist gas corresponding to the sub assist gas.
  • FIG. 25 illustrates a construction of a laser machining apparatus according to a sixteenth the embodiment.
  • the machining apparatus of the embodiment comprises respective assist gas (oxygen gas) sources 18, a control means 20 and sensors 19.
  • the assist gas sources 18 supplies the assist gas to a machining head having a nozzle construction as shown in FIG. 24.
  • the sensors 19 detect information regarding the temperature of the material surface, the groove width, and the amount of luminescence due to sparks during machining.
  • the control means 20 adjusts the gas flow quantity and the gas flow pressure of the main assist gas and the sub assist gas which are discharged from the nozzles depending on the information from the sensors 19. According to this construction, it is possible to avoid abnormal machining and to attain stable machining.
  • the machining head having a nozzle construction has respective assist gas source in the sixteenth embodiment. But, in case that the same assist gas source is used, the same effect is obtained by providing a control apparatus for controlling the apparatus for automatically driving the sub assist gas flow control apparatus and the gas flow from the same gas source as shown in the thirteenth and fourteenth embodiments, instead of the control apparatus shown in FIG. 25.
  • FIG. 26 illustrates a construction of a laser machining apparatus according to a seventeenth embodiment.
  • the machining apparatus of the seventeenth embodiment comprises a sensor 19 which predicts or detects self burning.
  • the machining apparatus operates to decrease at least one of the gas pressure and the gas flow quantity of the main assist gas and the sub assist gas when self burning is predicted or detected according to the information from the sensor 19. According to this construction, it is possible to avoid an outbreak of self burning and to attain stable machining.
  • FIG. 27 illustrates a construction a laser machining apparatus according to an eighteenth embodiment.
  • the machining apparatus of the eighteenth embodiment comprises an operation control means 21 for controlling the laser machining apparatus and a flow control means 20 for controlling the assist gas sources 18.
  • the operation control means 21 adjusts the gas flow quantity and the gas pressure of the main assist gas and the sub assist gas using programming control, for example, during piercing and corner cutting. Thereby, it is possible to adjust the flow quantity at the beginning of the piercing or to control accurately the flow quantity during cutting the corner portion. According to this construction, it is possible to avoid an outbreak of burning during piercing and cutting the corner portion and to attain more stable cutting and machining.
  • FIG. 28 is a longitudinal cross sectional view which illustrates a machining head of laser machining apparatus according to a nineteenth embodiment.
  • the machining head of the embodiment comprises a main assist gas nozzle 1 and a sub assist gas nozzle 2 which are separated.
  • the main assist gas nozzle 1 is mounted and fixed on a portion 22 which protrudes from the inside of the sub assist gas nozzle 2 as shown in FIG. 28.
  • the main assist gas nozzle 1 can be detachably mounted, many combinations of different nozzles having different small hole area and hole numbers for supplying the assist gas can be freely selected depending on the material and thickness of the work. Therefore, an appropriate flow quantity and appropriate flow ratio of the main assist gas versus the sub assist gas can be selected.
  • each nozzle is provided separately and fixed inside the wall of nozzle 2.
  • the fixing portion may comprise not only the protruding portion as shown in FIG. 28, but also the construction as shown in FIG. 29A and FIG. 29B.
  • FIG. 29A illustrates a level difference 22a inside of the nozzle 2
  • FIG. 29B illustrates a taper portion 22b inside of the nozzle 2.
  • FIG. 30 is a longitudinal cross sectional view which illustrates a machining head of laser machining apparatus according to a twentieth embodiment.
  • the material of the main assist gas nozzle 1 is different from that of the sub assist gas nozzle 2.
  • the material of the main assist gas nozzle 1 is a metal (brass, for example) which is easy to machine.
  • the material of the sub assist gas nozzle 2 located most outside is a metal which has a high melting point and high hardness. According to this construction, the outermost portion is hardly damaged by spattering due to oxide caused by the high temperature during cutting or splash of melted metal, and protects the inside nozzle 1, thereby the lifetime of the nozzle is extended.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
US08/139,888 1992-10-23 1993-10-22 Machining head and laser machining apparatus Expired - Lifetime US6118097A (en)

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US09/603,906 US6288363B1 (en) 1992-10-23 2000-06-26 Machining head and laser machining apparatus

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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6313432B1 (en) * 1997-06-20 2001-11-06 Tanaka Engineering Works, Ltd. Laser cutting method and laser cutter
US6316743B1 (en) * 1998-09-09 2001-11-13 Tanaka Engineering Works, Ltd. Laser piercing method, laser processing nozzle, and laser cutting apparatus
US6335507B1 (en) * 1998-10-12 2002-01-01 Fanuc Ltd. Laser-beam machining method, laser-beam machining device and auxiliary tool for piercing
WO2002043453A1 (en) * 2000-11-21 2002-05-30 Hypertherm, Inc. Configurable nozzle baffle apparatus and method
WO2003015977A1 (de) * 2001-08-08 2003-02-27 Robert Bosch Gmbh Vorrichtung zur reduzierung von ablationsprodukten auf der werks tückoberfläche beim laserbohrprozess
DE10160785C1 (de) * 2001-12-11 2003-08-28 Blz Gmbh Begasungsdüseneinheit für den Bearbeitungskopf einer Laser-Schweißeinrichtung
US20040227794A1 (en) * 2003-05-13 2004-11-18 Pollard Jeffrey R Laser micromachining and methods of same
WO2005053895A1 (en) 2003-12-05 2005-06-16 Spi Lasers Uk Limited Apparatus for the industrial processing of a material by optical radiation
US20060289398A1 (en) * 2005-05-11 2006-12-28 Hypertherm, Inc. Generating discrete gas jets in plasma arc torch applications
US20060289396A1 (en) * 2005-04-19 2006-12-28 Zheng Duan Apparatus for cooling plasma arc torch nozzles
WO2007059787A1 (de) * 2005-11-25 2007-05-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Laserbearbeitungsdüse
US20070262060A1 (en) * 2006-05-11 2007-11-15 Roberts Jesse A Dielectric devices for a plasma arc torch
US20080181155A1 (en) * 2007-01-31 2008-07-31 Texas Instruments Incorporated Apparatus for and method of detecting wireless local area network signals using a low power receiver
US20090101629A1 (en) * 2007-10-19 2009-04-23 Honeywell International, Inc. Erosion resistant torch
US20090223939A1 (en) * 2007-10-19 2009-09-10 Honeywell International, Inc. Variable orifice torch
US20100252541A1 (en) * 2009-03-31 2010-10-07 Ats Automation Tooling Systems Inc. Laser processing nozzle
CN102371433A (zh) * 2011-11-21 2012-03-14 苏州吉矽精密科技有限公司 一种激光切割头喷嘴装置
US20130087547A1 (en) * 2011-10-05 2013-04-11 Applied Materials, Inc. Particle control in laser processing systems
US20130104827A1 (en) * 2010-05-27 2013-05-02 Pascal Woerner Laser-induced spark ignition for an internal combustion engine
CN103170751A (zh) * 2013-04-18 2013-06-26 苏州光韵达光电科技有限公司 一种光纤激光切割陶瓷的方法
CN103192182A (zh) * 2013-04-18 2013-07-10 苏州光韵达光电科技有限公司 一种用于光纤激光切割陶瓷的喷嘴
US20130233836A1 (en) * 2010-10-09 2013-09-12 Christopher Dackson Method & apparatus for laser welding with mixed gas plasma suppression
US20150298243A1 (en) * 2012-11-08 2015-10-22 Sauer Ultrasonic Gmbh Tool, machine tool, machining method
US20170334022A1 (en) * 2015-10-30 2017-11-23 Hypertherm, Inc. Highly Positioned Laser Processing Nozzle
US10160059B2 (en) 2016-03-03 2018-12-25 General Electric Company Decoupled liquid-jet guided laser nozzle cap
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US10335900B2 (en) 2016-03-03 2019-07-02 General Electric Company Protective shield for liquid guided laser cutting tools
US10449560B2 (en) 2015-02-25 2019-10-22 Technology Research Association For Future Additive Manufacturing Optical processing nozzle and optical machining apparatus
US10549383B2 (en) 2015-10-30 2020-02-04 Hypertherm, Inc. Highly positioned laser processing nozzle
US10603745B2 (en) 2015-05-04 2020-03-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Cutting gas nozzle and laser cutting method having a displaceable sleeve for setting the flow characteristics
US10953493B2 (en) * 2017-07-07 2021-03-23 Arvinmeritor Technology, Llc Gas delivery system
US11084124B2 (en) 2017-07-28 2021-08-10 Amada Holdings Co., Ltd. Laser cutting nozzle and laser cutting method
US11465238B2 (en) * 2019-02-13 2022-10-11 Bystronic Laser Ag Gas guide, laser cutting head and laser cutting machine
US11850681B2 (en) 2015-10-30 2023-12-26 Hypertherm, Inc. Highly positioned laser processing nozzle

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1040514C (zh) * 1993-10-21 1998-11-04 三菱电机株式会社 加工头及激光加工装置
JP3399640B2 (ja) * 1994-07-08 2003-04-21 ファナック株式会社 レーザ加工方法
DE19915426A1 (de) * 1999-04-06 2000-11-09 Pein Andreas Medizintech Gmbh Wasserstrahleinrichtung zum Trennen einer biologischen Struktur
DE19959193A1 (de) * 1999-12-08 2001-06-21 Messer Cutting & Welding Ag Doppelwand-Brennschneiddüse
EP1354663B1 (en) * 2002-03-27 2005-02-02 LVD Company NV Nozzle for lasercutting
US6683277B1 (en) * 2002-12-20 2004-01-27 Osram Opto Semiconductors Laser ablation nozzle assembly
US7880116B2 (en) * 2003-03-18 2011-02-01 Loma Linda University Medical Center Laser head for irradiation and removal of material from a surface of a structure
US7060932B2 (en) 2003-03-18 2006-06-13 Loma Linda University Medical Center Method and apparatus for material processing
US7057134B2 (en) * 2003-03-18 2006-06-06 Loma Linda University Medical Center Laser manipulation system for controllably moving a laser head for irradiation and removal of material from a surface of a structure
US7379483B2 (en) * 2003-03-18 2008-05-27 Loma Linda University Medical Center Method and apparatus for material processing
US7286223B2 (en) * 2003-03-18 2007-10-23 Loma Linda University Medical Center Method and apparatus for detecting embedded rebar within an interaction region of a structure irradiated with laser light
US7038166B2 (en) * 2003-03-18 2006-05-02 Loma Linda University Medical Center Containment plenum for laser irradiation and removal of material from a surface of a structure
WO2006002258A2 (en) * 2004-06-22 2006-01-05 Vladimir Belashchenko High velocity thermal spray apparatus
US7750265B2 (en) * 2004-11-24 2010-07-06 Vladimir Belashchenko Multi-electrode plasma system and method for thermal spraying
WO2006132229A1 (ja) 2005-06-07 2006-12-14 Nissan Tanaka Corporation レーザピアシング方法及び加工装置
DE102005028243C5 (de) * 2005-06-17 2020-07-09 Precitec Gmbh & Co. Kg Düsenanordnung für einen Laserbearbeitungskopf
JP2007021528A (ja) * 2005-07-15 2007-02-01 Matsushita Electric Ind Co Ltd レーザ加工装置およびその調整方法
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TW200726566A (en) * 2006-01-10 2007-07-16 Li Bing Huan Laser processing machine
DE102007035395A1 (de) 2007-07-26 2009-01-29 Linde Ag Verfahren zum Plasmaschneiden
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DE102007035403A1 (de) 2007-07-26 2009-01-29 Linde Ag Verfahren zum thermischen Trennen
DE102009017441A1 (de) 2009-04-15 2010-10-21 Linde Aktiengesellschaft Verfahren zum Laserstrahltrennen
EP2409808A1 (de) * 2010-07-22 2012-01-25 Bystronic Laser AG Laserbearbeitungsmaschine
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US9289852B2 (en) 2011-01-27 2016-03-22 Bystronic Laser Ag Laser processing machine, laser cutting machine, and method for adjusting a focused laser beam
EP2883647B1 (de) 2013-12-12 2019-05-29 Bystronic Laser AG Verfahren zur Konfiguration einer Laserbearbeitungsvorrichtung
DE202015102740U1 (de) * 2015-05-27 2016-08-31 Uwe Bergmann Laserschweißvorrichtung mit Spritzerschutzeinrichtung
SE544166C2 (sv) * 2019-02-08 2022-02-15 Vaederstad Holding Ab Lasermunstycke, insats för ett lasermunstycke, laserskäranordning samt förfaranden för laserskärning

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121085A (en) * 1976-05-07 1978-10-17 Caterpillar Tractor Co. Gas nozzle for laser welding
JPS6054293A (ja) * 1983-09-06 1985-03-28 Toshiba Corp レ−ザ切断方法
JPS6160757A (ja) * 1984-08-20 1986-03-28 ダウ　コーニング　コーポレーシヨン 硬化性シリコーン組成物
JPS6356389A (ja) * 1986-08-25 1988-03-10 Amada Co Ltd レ−ザ加工機の加工ヘツド
JPS6376785A (ja) * 1986-09-19 1988-04-07 Hitachi Ltd レ−ザビ−ム加工用マルチノズル
JPH01181991A (ja) * 1988-01-18 1989-07-19 Komatsu Ltd レーザ切断における切断用ノズルの構造とその切断方法
JPH02263585A (ja) * 1989-04-03 1990-10-26 Sumitomo Metal Ind Ltd 複合熱源溶接装置
JPH03142094A (ja) * 1989-10-25 1991-06-17 Fanuc Ltd レーザ加工機の加工ヘッド
DE4016200A1 (de) * 1990-05-19 1991-11-21 Linde Ag Duese zum laserstrahlschweissen oder laserstrahlschneiden
US5111021A (en) * 1990-10-16 1992-05-05 Societe Nationale Industrielle Et Aerospatiale Laser surface treatment nozzle with powder supply
US5149937A (en) * 1989-07-14 1992-09-22 Maho Aktiengesellschaft Process and device for the manufacture of cavities in workpieces through laser beams
US5220149A (en) * 1990-10-06 1993-06-15 Trumpf Gmbh & Co. Laser nozzle

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4774392A (en) * 1985-04-16 1988-09-27 Amada Engineering & Service Co., Inc. Laser cutting method for high chromium steel and a device to carry out that method
DE3824048A1 (de) * 1988-07-15 1990-05-03 Fraunhofer Ges Forschung Verfahren und vorrichtung zum bearbeiten von werkstuecken mit laserstrahlung
DE3824047A1 (de) * 1988-07-15 1990-01-18 Fraunhofer Ges Forschung Vorrichtung zum bearbeiten von werkstuecken mit strahlung
US5043548A (en) * 1989-02-08 1991-08-27 General Electric Company Axial flow laser plasma spraying
US4992643A (en) * 1989-08-25 1991-02-12 United States Department Of Energy Method and device for controlling plume during laser welding
DE3935009A1 (de) * 1989-10-20 1991-04-25 Inst Nat Sciences Appliq Vorrichtung fuer die laser-plasmabeschichtung
US5387996A (en) * 1992-07-20 1995-02-07 Hughes Aircraft Company Method of obtaining a narrow field of view scan
JP3142094B2 (ja) 1992-12-15 2001-03-07 日本バイリーン株式会社 ノズルプレート

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121085A (en) * 1976-05-07 1978-10-17 Caterpillar Tractor Co. Gas nozzle for laser welding
JPS6054293A (ja) * 1983-09-06 1985-03-28 Toshiba Corp レ−ザ切断方法
JPS6160757A (ja) * 1984-08-20 1986-03-28 ダウ　コーニング　コーポレーシヨン 硬化性シリコーン組成物
JPS6356389A (ja) * 1986-08-25 1988-03-10 Amada Co Ltd レ−ザ加工機の加工ヘツド
JPS6376785A (ja) * 1986-09-19 1988-04-07 Hitachi Ltd レ−ザビ−ム加工用マルチノズル
JPH01181991A (ja) * 1988-01-18 1989-07-19 Komatsu Ltd レーザ切断における切断用ノズルの構造とその切断方法
JPH02263585A (ja) * 1989-04-03 1990-10-26 Sumitomo Metal Ind Ltd 複合熱源溶接装置
US5149937A (en) * 1989-07-14 1992-09-22 Maho Aktiengesellschaft Process and device for the manufacture of cavities in workpieces through laser beams
JPH03142094A (ja) * 1989-10-25 1991-06-17 Fanuc Ltd レーザ加工機の加工ヘッド
DE4016200A1 (de) * 1990-05-19 1991-11-21 Linde Ag Duese zum laserstrahlschweissen oder laserstrahlschneiden
US5220149A (en) * 1990-10-06 1993-06-15 Trumpf Gmbh & Co. Laser nozzle
US5111021A (en) * 1990-10-16 1992-05-05 Societe Nationale Industrielle Et Aerospatiale Laser surface treatment nozzle with powder supply

Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6313432B1 (en) * 1997-06-20 2001-11-06 Tanaka Engineering Works, Ltd. Laser cutting method and laser cutter
US6316743B1 (en) * 1998-09-09 2001-11-13 Tanaka Engineering Works, Ltd. Laser piercing method, laser processing nozzle, and laser cutting apparatus
US6335507B1 (en) * 1998-10-12 2002-01-01 Fanuc Ltd. Laser-beam machining method, laser-beam machining device and auxiliary tool for piercing
WO2002043453A1 (en) * 2000-11-21 2002-05-30 Hypertherm, Inc. Configurable nozzle baffle apparatus and method
US6667459B1 (en) 2000-11-21 2003-12-23 Hypertherm, Inc. Configurable nozzle baffle apparatus and method
US20050006362A1 (en) * 2001-08-08 2005-01-13 Bertrand Joseph Device for reducing the ablation products on the surface of a work piece during laser drilling
WO2003015977A1 (de) * 2001-08-08 2003-02-27 Robert Bosch Gmbh Vorrichtung zur reduzierung von ablationsprodukten auf der werks tückoberfläche beim laserbohrprozess
US7022941B2 (en) 2001-08-08 2006-04-04 Robert Bosch Gmbh Device for reducing the ablation products on the surface of a work piece during laser drilling
DE10160785C1 (de) * 2001-12-11 2003-08-28 Blz Gmbh Begasungsdüseneinheit für den Bearbeitungskopf einer Laser-Schweißeinrichtung
US20040227794A1 (en) * 2003-05-13 2004-11-18 Pollard Jeffrey R Laser micromachining and methods of same
US7754999B2 (en) * 2003-05-13 2010-07-13 Hewlett-Packard Development Company, L.P. Laser micromachining and methods of same
WO2005053895A1 (en) 2003-12-05 2005-06-16 Spi Lasers Uk Limited Apparatus for the industrial processing of a material by optical radiation
US20060219673A1 (en) * 2003-12-05 2006-10-05 Spi Lasers Uk Ltd Apparatus for the industrial processing of a material by optical radiation
US7592568B2 (en) 2003-12-05 2009-09-22 Spi Lasers Uk Ltd. Apparatus for the industrial processing of a material by optical radiation
US7829816B2 (en) 2005-04-19 2010-11-09 Hypertherm, Inc. Plasma arc torch providing angular shield flow injection
US20060289396A1 (en) * 2005-04-19 2006-12-28 Zheng Duan Apparatus for cooling plasma arc torch nozzles
US20070007256A1 (en) * 2005-04-19 2007-01-11 Zheng Duan Plasma arc torch providing angular shield flow injection
US20110062124A1 (en) * 2005-04-19 2011-03-17 Hypertherm, Inc. Plasma arc torch providing angular shield flow injection
US8395077B2 (en) 2005-04-19 2013-03-12 Hypertherm, Inc. Plasma arc torch providing angular shield flow injection
US7605340B2 (en) 2005-04-19 2009-10-20 Hypertherm, Inc. Apparatus for cooling plasma arc torch nozzles
US20060289398A1 (en) * 2005-05-11 2006-12-28 Hypertherm, Inc. Generating discrete gas jets in plasma arc torch applications
US7598473B2 (en) * 2005-05-11 2009-10-06 Hypertherm, Inc. Generating discrete gas jets in plasma arc torch applications
CN101321601B (zh) * 2005-11-25 2011-05-11 通快机床两合公司 激光加工喷嘴
US20080237207A1 (en) * 2005-11-25 2008-10-02 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Nozzle for a Laser Machining Device
US8188403B2 (en) 2005-11-25 2012-05-29 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Nozzle for a laser machining device
WO2007059787A1 (de) * 2005-11-25 2007-05-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Laserbearbeitungsdüse
US8097828B2 (en) 2006-05-11 2012-01-17 Hypertherm, Inc. Dielectric devices for a plasma arc torch
US20070262060A1 (en) * 2006-05-11 2007-11-15 Roberts Jesse A Dielectric devices for a plasma arc torch
US20080181155A1 (en) * 2007-01-31 2008-07-31 Texas Instruments Incorporated Apparatus for and method of detecting wireless local area network signals using a low power receiver
US20090223939A1 (en) * 2007-10-19 2009-09-10 Honeywell International, Inc. Variable orifice torch
US7977599B2 (en) 2007-10-19 2011-07-12 Honeywell International Inc. Erosion resistant torch
US20090101629A1 (en) * 2007-10-19 2009-04-23 Honeywell International, Inc. Erosion resistant torch
US7842898B2 (en) 2007-10-19 2010-11-30 Honeywell International Inc. Variable orifice torch
US20100252541A1 (en) * 2009-03-31 2010-10-07 Ats Automation Tooling Systems Inc. Laser processing nozzle
US8642919B2 (en) 2009-03-31 2014-02-04 Ats Automation Tooling Systems Inc. Laser processing nozzle
US20130104827A1 (en) * 2010-05-27 2013-05-02 Pascal Woerner Laser-induced spark ignition for an internal combustion engine
US20130233836A1 (en) * 2010-10-09 2013-09-12 Christopher Dackson Method & apparatus for laser welding with mixed gas plasma suppression
US9102009B2 (en) * 2010-10-09 2015-08-11 Christopher Dackson Method and apparatus for laser welding with mixed gas plasma suppression
US9579750B2 (en) * 2011-10-05 2017-02-28 Applied Materials, Inc. Particle control in laser processing systems
US20130087547A1 (en) * 2011-10-05 2013-04-11 Applied Materials, Inc. Particle control in laser processing systems
CN102371433A (zh) * 2011-11-21 2012-03-14 苏州吉矽精密科技有限公司 一种激光切割头喷嘴装置
US20150298243A1 (en) * 2012-11-08 2015-10-22 Sauer Ultrasonic Gmbh Tool, machine tool, machining method
US9724779B2 (en) * 2012-11-08 2017-08-08 Sauer Ultrasonic Gmbh Tool, machine tool, machining method
CN103192182A (zh) * 2013-04-18 2013-07-10 苏州光韵达光电科技有限公司 一种用于光纤激光切割陶瓷的喷嘴
CN103170751A (zh) * 2013-04-18 2013-06-26 苏州光韵达光电科技有限公司 一种光纤激光切割陶瓷的方法
US10449560B2 (en) 2015-02-25 2019-10-22 Technology Research Association For Future Additive Manufacturing Optical processing nozzle and optical machining apparatus
US10603745B2 (en) 2015-05-04 2020-03-31 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Cutting gas nozzle and laser cutting method having a displaceable sleeve for setting the flow characteristics
US11135675B2 (en) 2015-05-04 2021-10-05 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Gas nozzle having a displaceable valve sleeve
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US20170334022A1 (en) * 2015-10-30 2017-11-23 Hypertherm, Inc. Highly Positioned Laser Processing Nozzle
US10549383B2 (en) 2015-10-30 2020-02-04 Hypertherm, Inc. Highly positioned laser processing nozzle
US10569360B2 (en) * 2015-10-30 2020-02-25 Hypertherm, Inc. Highly positioned laser processing nozzle
US11850681B2 (en) 2015-10-30 2023-12-26 Hypertherm, Inc. Highly positioned laser processing nozzle
US10160059B2 (en) 2016-03-03 2018-12-25 General Electric Company Decoupled liquid-jet guided laser nozzle cap
US10335900B2 (en) 2016-03-03 2019-07-02 General Electric Company Protective shield for liquid guided laser cutting tools
US10953493B2 (en) * 2017-07-07 2021-03-23 Arvinmeritor Technology, Llc Gas delivery system
US11084124B2 (en) 2017-07-28 2021-08-10 Amada Holdings Co., Ltd. Laser cutting nozzle and laser cutting method
CN109128599A (zh) * 2018-09-26 2019-01-04 江苏天工科技股份有限公司 钛合金熔炼设备辅助冷却结构
CN109128599B (zh) * 2018-09-26 2023-10-20 江苏天工科技股份有限公司 钛合金熔炼设备辅助冷却结构
US11465238B2 (en) * 2019-02-13 2022-10-11 Bystronic Laser Ag Gas guide, laser cutting head and laser cutting machine

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US6288363B1 (en) 2001-09-11

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